Journal
INORGANIC CHEMISTRY
Volume 51, Issue 7, Pages 4007-4014Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ic202071n
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Funding
- Spanish MICINN [MAT2010-19837-C06-03]
- CAM [MATERYENER-2, P2009/PPQ-1629]
- National Science Foundation [DMR-0907356]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0907356] Funding Source: National Science Foundation
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The structures of the doubly ordered perovskites NaCeMnWO6 and NaPrMnWO6, with rock salt ordering of the Mn2+ and W6+ B-site cations and layered ordering of the Na+ and (Ce3+/Pr3+) A-site cations, have been studied by transmission electron microscopy, electron diffraction, neutron and synchrotron X-ray powder diffraction. Both compounds possess incommensurately modulated crystal structures. In NaCeMnWO6 the modulation vector (with reference to the ideal ABX(3) perovskite subcell) is q approximate to 0.067a* (similar to 58.7 angstrom) and in NaPrMnWO6 q approximate to 0.046a* (similar to 85.3 angstrom). In both compounds the superstructures are primarily the two-dimensional chessboard type, although some crystals of NaCeMnWO6 were found with one-dimensional stripes. In some crystals of NaPrMnWO6 there is a coexistence of chessboards and stripes. Modeling of neutron diffraction data shows that octahedral tilting plays an important role in the structural modulation.
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